issuing flush to all namespaces

[Klaus Jensen]

Hi,

Since the (very reasonable) changes that cause the driver to check that
the nsid of the command corresponds to the nsid of the namespace being
targeted it is no longer possible to issue a flush to all namespaces:

   # nvme flush /dev/nvme0n1 -n 0xffffffff
   flush: Invalid argument

Now, I think we can all agree that Flush is the odd one out here, but
can we do anything about it? The char devices also check the nsid, so
they can't be used either.
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